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Honda Dual Mode Charging System

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Honda dual mode charging system. For many years Honda and Acura have utilized a dual mode charging system to increase fuel efficiency and to decrease the drag on the engine when starting. Hondas Dual Mode Charging System For many years Honda and Acura have utilized a dual mode charging system to increase fuel efficiency and to decrease the drag on the engine when starting. This system decreases drag on the engine while cranking and reduces charging system output engine load for improved fuel economy.

I would recommend googling Honda Dual Mode Charging for a white paper on the subject. Starting with many 2008 Honda and Acura vehicles use a dual-mode charging system. Similar to other systems the PCM controls the alternator.

On startup the alternator does not appear to be charging but after several seconds it suddenly comes alive and begins to charge. When the headlights are on or any other combination of things that increases the amp draw through the system to a certain point the computer tells the alernator to put out 144V or thereabouts. Honda autos have something called the Dual-Mode charging system which sets the alternator at 144V when heavy electrical loads are present but drops it back to 124V otherwise.

That said Honda does. Only show this user. It is known that Honda vehicles have been using this dual-mode charging system since the late 1990s.

However I read a paper about Hondas dual-mode charging system. Honda Dual Mode Charging systems. Honda uses a dual-mode charging system on most 1990-2012 applications figure 3.

Since each naturally aspirated hybrid and electric vehicle including is different always refer to your vehicle service manual. If you raise the engine RPM to 2000 you may notice the charging system voltage drop unexpectedly. Yea dont do that.

The system consists of an Electric Load Detector ELD to determine vehicle electrical load an alternator with an internal voltage regulator and communication with the ECM. Hondas Dual-Mode Charging System.

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I would recommend googling Honda Dual Mode Charging for a white paper on the subject.

Battery was toast but if you like getting technical with electrical systems. This system decreases drag on the engine while cranking and reduces charging system output engine load for improved fuel economy. Questions Answered Every 9 Seconds. This simply validates that your charging system is working correctly and that there is no notable ripple voltage which would indicate a leaky or bad diode which can discharge an idle vehicle. The ECU uses the ELDs inputs to adjust alternator output and compensate for the additional electrical loads. Only show this user. Honda Dual Mode Charging systems. That said Honda does. Starting system troubles are often confused with charging system problems.


The system consists of an Electric Load Detector ELD to determine vehicle electrical load an alternator with an internal voltage regulator and communication with the ECM. I would recommend googling Honda Dual Mode Charging for a white paper on the subject. Ad A Mechanic Will Answer in Minutes. Since each naturally aspirated hybrid and electric vehicle including is different always refer to your vehicle service manual. The 124 V level leaves the battery only partially charged - about 60-70 - and I assume the thinking is that so long as it will still start the car theres no point wasting gasoline keeping it charged any higher than that. A system overview by Omar Trinidad at Southern Illinois University. The two modes can accomplish as much as 10 load reduction on the engine by allowing the Electric Control Module ECM to determine charging rates based on information gathered.

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